WO2012076415A1 - Corps d'injecteur à orifice d'injection conique - Google Patents

Corps d'injecteur à orifice d'injection conique Download PDF

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Publication number
WO2012076415A1
WO2012076415A1 PCT/EP2011/071640 EP2011071640W WO2012076415A1 WO 2012076415 A1 WO2012076415 A1 WO 2012076415A1 EP 2011071640 W EP2011071640 W EP 2011071640W WO 2012076415 A1 WO2012076415 A1 WO 2012076415A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle body
injection hole
injection
hole
recess
Prior art date
Application number
PCT/EP2011/071640
Other languages
German (de)
English (en)
Inventor
Uwe Leuteritz
Ferdinand Löbbering
Eberhard Kull
Original Assignee
Continental Automotive Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2012076415A1 publication Critical patent/WO2012076415A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1846—Dimensional characteristics of discharge orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent

Definitions

  • Such nozzle bodies are used, for example, in injectors for diesel engines. When installed, the nozzle body forms the tip of a Kraftstoffin ector and protrudes into a combustion chamber of a cylinder head. Symmetrical around one
  • a nozzle body recess is arranged, which opens in the direction of the combustion chamber in a blind hole. From the blind hole go out one or more injection holes through which fuel can be injected into the combustion chamber. At its end opposite the combustion chamber, the nozzle body recess is in communication with a pressurized fuel supply line.
  • a valve member such as a nozzle needle, movably mounted in the nozzle body recess.
  • the valve member has a sealing edge, which is pressed in the closed state of the injection valve to form a sealing seat by a spring on a sealing surface in the Düsen redesignaus foundedung. In this state, the lying below the sealing seat and the blind hole, so that no injection of fuel occurs into the combustion chamber A ⁇ injection holes separated from the fuel supply line are.
  • the nozzle needle is actuated directly or indirectly actuated by an actuator against the spring force lifted from the sealing seat and moved to an open position. Then fuel can flow from the fuel supply line into the blind hole. As a result, the pressure in the blind hole increases and the fuel is injected through the injection holes in the combustion chamber of the internal combustion engine. In operation affect parameters such as the flow behavior and the flow rate of fuel through the injection holes ⁇ , the combustion process in the combustion chamber.
  • parameters such as the flow behavior and the flow rate of fuel through the injection holes ⁇ , the combustion process in the combustion chamber.
  • due to increasingly stringent legal regulations an ever-optimized control of the combustion process in terms of fuel consumption and emissions becomes necessary. This also requires improved control of the flow behavior through the injection holes.
  • a rounding of the injection holes occurring during operation can lead to an altered flow behavior in the spray hole.
  • a rounding can be caused during operation by the fuel flow.
  • fuel flows through the nozzle body recess into the injection holes and into the combustion chamber.
  • this flow deflection of the fuel can cause a material removal by flow erosions or cavitations at the inlet edge to the spray hole. This leads to a rounding of the inlet edge.
  • An inventive nozzle body comprises a nozzle body recess. From the nozzle body recess extends at least one conical injection hole to an outer surface of the nozzle body. At its side facing the nozzle body recess ⁇ end of the injection hole has an entry opening and at its opposite, facing away from the nozzle body recess end an outlet opening. According to the invention, the inlet diameter of the inlet opening is greater than the outlet diameter of the outlet opening.
  • a conical inner surface of the injection hole forms an edge with an inner surface of the nozzle body recess.
  • An edge in the context of this patent application means that the radius of curvature at the transition between the inner surface of the nozzle body recess and the inner surface of the injection hole is very small.
  • the radius of curvature is less than 5 ⁇ , more preferably less than 3 ⁇ and ideally smaller than the Meß stressessgrenze.
  • the invention is based on the surprising finding that the influence of the rounding on the flow coefficient at a conical injection hole is reduced. Therefore, from a certain taper of the injection hole causes a rounding of the inlet opening no change in the flow coefficient. Therefore, according to the invention, it is possible to dispense with pre-rounding during production from a certain conicity of the injection hole. As a result, manufacturing costs can be saved.
  • the CF value of at least one A ⁇ injection hole is larger than the third
  • the CF value of the at least one injection hole is greater than or equal to 3.5 and more preferably greater than or equal to 5.
  • even larger CF values are possible and advantageous.
  • the high conicity of the injection hole offers the advantage that a subsequent rounding of the injection hole during operation does not or only to a very small extent affect the flow rate or the flow coefficient. A flow coefficient which changes during operation can therefore be largely avoided or at least reduced to a permissible level even without preliminary rounding during production. Minor variations may be compensated for by modern engine controls. Therefore, by dispensing with a separate rounding process in the manufacture of the nozzle body according to the invention costs and production costs can be saved.
  • Typical outlet diameters of the injection holes are in the range between 70-200 .mu.m. In principle, larger From ⁇ occurs diameter are possible.
  • Typical lengths of the injection holes are greater than 0.5 mm, preferably greater than 0.7 mm and less than 1.5 mm, preferably less than 0.8 mm.
  • the conical inner surface of the injection hole extends over the entire length of the injection hole with the same conicity. That is, the injection hole has a certain opening angle over its entire length. There is thus no edge in the interior of the injection hole between the inlet opening and the outlet opening.
  • the nozzle body recess merges into a blind hole at the end facing the combustion chamber.
  • the at least one injection hole or the injection holes then extend from the blind hole to the outer surface of the nozzle body.
  • injection holes are also possible, which extend between a conical nozzle needle seat and the outer surface of the nozzle body.
  • the nozzle body according to the invention has a plurality of injection holes.
  • the inner surface of the nozzle body recess is preferably at least in the region of the inlet opening of the injection hole a symmetrical about the longitudinal axis of the nozzle body, zy ⁇ - cylindrical or conical surface.
  • the at least one A ⁇ injection hole is preferably perpendicular to this inner surface.
  • a central center axis of the injection hole and the inner surface of the nozzle body recess are normal to each other at an imaginary intersection.
  • a nozzle body with a nozzle body recess is provided according to the invention.
  • at least one conical injection hole ⁇ is formed, wherein the inlet opening in the region of the Düsen endeavoraus Principleung is greater than the outlet opening at the Outer surface of the nozzle body.
  • An injection holes may be formed for example by an erosion process or a laser process.
  • an electrode is moved to the outer surface of the nozzle body, with the nozzle body and the electrode not touching each other.
  • an electrical voltage between the nozzle body and electrode is applied.
  • the polarity of the voltage is chosen so that material is dissolved out of the nozzle body by flashovers. By this removal of material a hole is created in the SI ⁇ seneffort.
  • the electrode is flushed with a flushing medium, for example distilled water, which removes the dissolved material.
  • Eroding process achievable in the entire spray hole surface roughness is greater than the surface roughness in a conventional injection hole after a hydro-erosive rounding process.
  • rounding process is advantageously in the upper ⁇ psychrauhtechnikswert Ra throughout the spray hole in the range of 0.1 to 0.8 ⁇ ⁇ (according to DIN EN ISO 4287).
  • Ra is greater than or equal to 0.2 ⁇ , more preferably greater than or equal to 0.3 ⁇ , and particularly preferably greater than or equal to 0.4 ⁇ .
  • the method according to the invention produces a nozzle body in which the inlet opening of the at least one injection hole is arranged in the region of the blind hole.
  • the nozzle body recess 2 with the blind hole 6 has a conical inner surface 5. At the transition between the co- Niche inner surface 4 of the injection hole 3 and the conical inner surface 5 of the blind hole 6, an edge 8 is formed. This has a radius of curvature of less than

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Corps d'injecteur (1) pour un injecteur de moteur à combustion interne, comportant un évidement et au moins un orifice d'injection (3) s'étendant de l'évidement (2) du corps d'injecteur à la surface externe du corps d'injecteur. Selon l'invention, l'orifice d'injection est conique et présente une valeur CF au moins égale à 3. L'ouverture d'entrée (E) de l'orifice d'injection, à son extrémité orientée vers l'évidement du corps d'injecteur, est supérieure à l'ouverture de sortie (A) de l'orifice d'injection à son extrémité opposée à l'évidement du corps d'injecteur. La surface interne (4) conique de l'orifice d'injection forme un bord avec une surface interne (5) de l'évidement du corps d'injecteur.
PCT/EP2011/071640 2010-12-10 2011-12-02 Corps d'injecteur à orifice d'injection conique WO2012076415A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010062808.5 2010-12-10
DE201010062808 DE102010062808A1 (de) 2010-12-10 2010-12-10 Düsenkörper mit konischem Einspritzloch

Publications (1)

Publication Number Publication Date
WO2012076415A1 true WO2012076415A1 (fr) 2012-06-14

Family

ID=45063179

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/071640 WO2012076415A1 (fr) 2010-12-10 2011-12-02 Corps d'injecteur à orifice d'injection conique

Country Status (2)

Country Link
DE (1) DE102010062808A1 (fr)
WO (1) WO2012076415A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015014476A1 (fr) * 2013-07-30 2015-02-05 L'orange Gmbh Injecteur de carburant à deux combustibles
JP2017141682A (ja) * 2016-02-08 2017-08-17 株式会社Ｓｏｋｅｎ 燃料噴射ノズル

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352926A1 (fr) * 1988-07-26 1990-01-31 LUCAS INDUSTRIES public limited company Injecteurs de combustible pour moteurs à combustion interne
DE10354467A1 (de) * 2003-11-21 2005-06-09 Robert Bosch Gmbh Brennstoffeinspritzventil
EP1840368A2 (fr) * 2006-03-27 2007-10-03 Robert Bosch Gmbh Buse d'injection dotée de canaux d'injection et procédé d'introduction de canaux

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352926A1 (fr) * 1988-07-26 1990-01-31 LUCAS INDUSTRIES public limited company Injecteurs de combustible pour moteurs à combustion interne
DE10354467A1 (de) * 2003-11-21 2005-06-09 Robert Bosch Gmbh Brennstoffeinspritzventil
EP1840368A2 (fr) * 2006-03-27 2007-10-03 Robert Bosch Gmbh Buse d'injection dotée de canaux d'injection et procédé d'introduction de canaux

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
YALCIN H ET AL: "KONISCHE EINSPRITZLOCHER EINES KRAFTSTOFFEINSPRITZVENTILS FUER BRENKRAFTMASCHINEN", SIEMENS TECHNIK REPORT, SIEMENS AG.,ERLANGEN, AT, vol. 2, no. 2, 1 January 1999 (1999-01-01), pages 73/74, XP000828544, ISSN: 1436-7777 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015014476A1 (fr) * 2013-07-30 2015-02-05 L'orange Gmbh Injecteur de carburant à deux combustibles
JP2017141682A (ja) * 2016-02-08 2017-08-17 株式会社Ｓｏｋｅｎ 燃料噴射ノズル

Also Published As

Publication number Publication date
DE102010062808A1 (de) 2012-06-21

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